What is the weight of concrete cover (lid) to round shape well with a diameter 1.8 m, if the thickness of the cover is 11 cm? 1 m3 of concrete weighs 2190 kg.

Correct answer:

m =  613 kg

Step-by-step explanation:

m=ρV=ρπr2h m=π2190(1.8/2)211/100=613 kg

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